background: the basis of spermatogenesis is the spermatogonial stem cells (sscs). the concentration of sscs is very small. however, a system that supports the proliferation and maintenance of sscs in vitro could be used to preserve and expand sscs numbers as well as increase success in transplantation. it is a new avenue to restore spermatogenesis in azoospermia subjects. objective: proliferati...

CuO-CeO2 nanocomposite is reported as a green recyclable catalyst for the chemoselective synthesis of pentaerythritol diacetals from aromatic aldehydes under solvent-free conditions. The catalyst was synthesized by co-precipitation method and characterized by XRD, BET specific surface area, FESEM and EDS analysis. This procedure provides some advantages such as simple work-up, clean procedure, ...

simple harmonizable processes (shp) introduced by soltani and parvardeh (2006) are a large class of nonstationary processes which includes stationary and periodically correlated (pc) processes. detection and estimation of shp structure are important problems when dealing with nonstationary data. in this paper, we study the spectral properties of simple processes and propose a method to detect a...

this article aims at contrasting aspectual oppositions in english and persian in the context of the novel the old man and the sea, and its translation by daryabandari (1983) as the data. unlike english, in persian perfective and imperfective forms are morphologically marked. while the vast majority of english simple past forms are translated into persian by past perfective forms, only less than...

we introduce and  study  fuzzy (co-)inner product and fuzzy(co-)norm of hyperspaces. in this regard by considering  the notionof hyperspaces, as a generalization of vector spaces, first we willintroduce the notion of fuzzy (co-)inner product in hyperspaces and will apply it to formulate the notions offuzzy (co-)norm and fuzzy (co-)orthogonality  in hyperspaces. inparticular, we will prove that ...